High-durability surface-discharge flash x-ray tube driven by a two-stage Marx pulser

Details High-durability surface-discharge flash x-ray tube driven by a two-stage Marx pulser High-durability surface-discharge flash x-ray tube driven by a two-stage Marx pulser

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1737..140s&link_type=abstract

Proc. SPIE Vol. 1737, p. 140-151, Neutrons, X Rays, and Gamma Rays: Imaging Detectors, Material Characterization Techniques, and

Statistics

Applications

Scientific paper

We developed a high-durability flash x-ray tube with a plate-shaped ferrite cathode for the use in the field of biomedical engineering and technology. The surface-discharge cathode was very useful for generating stable flash x rays. This flash x-ray generator consisted of the following essential components: a high-voltage power supply, an energy-storage condenser of 97 nF, a two-stage Marx type pulser, an oil diffusion pump, and a flash x-ray tube. This x-ray tube was of a diode which was connected to the turbo molecular pump and had plate-shaped anode and cathode electrodes. The cathode electrode was made of ferrite, and its edge was covered with a thin gold film by means of the spattering in order to decrease contact resistance. The space between the anode and cathode electrodes could be regulated from the outside of the x-ray rube. The two condensers in Marx circuit were charged from 50 to 70 kV by a power supply, and the condensers were connected in series after closing a gap switch. Thus the maximum output voltages from the pulser were about two times the charged voltages. In this experiment, the maximum tube voltage and the current were about 110 kV and 0.8 kA, respectively. The pulse widths were less than 140 ns, and the maximum x-ray intensity was 1.27 (mu) C/kg at 0.5 m per pulse. The size of the focal spot and the maximum repetition rate were about 2 X 2.5 mm and 50 Hz (fps), respectively.

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